/*
 * This program is free software: you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <http://www.gnu.org/licenses/>.
 */
package net.sf.l2j.gameserver.ai;

import static net.sf.l2j.gameserver.ai.CtrlIntention.AI_INTENTION_ACTIVE;
import static net.sf.l2j.gameserver.ai.CtrlIntention.AI_INTENTION_ATTACK;

import java.util.List;

import javolution.util.FastList;
import net.sf.l2j.gameserver.model.L2Attackable;
import net.sf.l2j.gameserver.model.L2Character;
import net.sf.l2j.gameserver.model.L2Character.AIAccessor;
import net.sf.l2j.gameserver.model.L2Object;
import net.sf.l2j.gameserver.model.L2Skill;
import net.sf.l2j.gameserver.model.MobGroup;
import net.sf.l2j.gameserver.model.MobGroupTable;
import net.sf.l2j.gameserver.model.actor.instance.L2ControllableMobInstance;
import net.sf.l2j.gameserver.model.actor.instance.L2DoorInstance;
import net.sf.l2j.gameserver.model.actor.instance.L2FolkInstance;
import net.sf.l2j.gameserver.model.actor.instance.L2NpcInstance;
import net.sf.l2j.gameserver.model.actor.instance.L2PcInstance;
import net.sf.l2j.gameserver.util.Util;
import net.sf.l2j.util.Rnd;

/**
 * @author littlecrow AI for controllable mobs
 */
public class L2ControllableMobAI extends L2AttackableAI {
	public static final int AI_IDLE = 1;
	public static final int AI_NORMAL = 2;
	public static final int AI_FORCEATTACK = 3;
	public static final int AI_FOLLOW = 4;
	public static final int AI_CAST = 5;
	public static final int AI_ATTACK_GROUP = 6;
	private int _alternateAI;
	private boolean _isThinking; // to prevent thinking recursively
	private boolean _isNotMoving;
	private L2Character _forcedTarget;
	private MobGroup _targetGroup;

	protected void thinkFollow() {
		L2Attackable me = (L2Attackable) _actor;
		if (!Util.checkIfInRange(MobGroupTable.FOLLOW_RANGE, me,
				getForcedTarget(), true)) {
			int signX = Rnd.nextInt(2) == 0 ? -1 : 1;
			int signY = Rnd.nextInt(2) == 0 ? -1 : 1;
			int randX = Rnd.nextInt(MobGroupTable.FOLLOW_RANGE);
			int randY = Rnd.nextInt(MobGroupTable.FOLLOW_RANGE);
			moveTo(getForcedTarget().getX() + signX * randX, getForcedTarget()
					.getY() + signY * randY, getForcedTarget().getZ());
		}
	}

	@Override
	protected void onEvtThink() {
		if (isThinking() || _actor.isAllSkillsDisabled())
			return;
		setThinking(true);
		try {
			switch (getAlternateAI()) {
			case AI_IDLE:
				if (getIntention() != CtrlIntention.AI_INTENTION_ACTIVE)
					setIntention(CtrlIntention.AI_INTENTION_ACTIVE);
				break;
			case AI_FOLLOW:
				thinkFollow();
				break;
			case AI_CAST:
				thinkCast();
				break;
			case AI_FORCEATTACK:
				thinkForceAttack();
				break;
			case AI_ATTACK_GROUP:
				thinkAttackGroup();
				break;
			default:
				if (getIntention() == AI_INTENTION_ACTIVE)
					thinkActive();
				else if (getIntention() == AI_INTENTION_ATTACK)
					thinkAttack();
				break;
			}
		} finally {
			setThinking(false);
		}
	}

	protected void thinkCast() {
		L2Attackable npc = (L2Attackable) _actor;
		if (getAttackTarget() == null || getAttackTarget().isAlikeDead()) {
			setAttackTarget(findNextRndTarget());
			clientStopMoving(null);
		}
		if (getAttackTarget() == null)
			return;
		npc.setTarget(getAttackTarget());
		L2Skill[] skills = null;
		// double dist2 = 0;
		try {
			skills = _actor.getAllSkills();
			// dist2 = _actor.getPlanDistanceSq(getAttackTarget().getX(),
			// getAttackTarget().getY());
		} catch (NullPointerException e) {
			_log.warning("Encountered Null Value.");
			e.printStackTrace();
		}
		if (!_actor.isMuted()) {
			int max_range = 0;
			// check distant skills
			for (L2Skill sk : skills) {
				if (Util.checkIfInRange(sk.getCastRange(), _actor,
						getAttackTarget(), true)
						&& !_actor.isSkillDisabled(sk.getId())
						&& _actor.getCurrentMp() > _actor.getStat()
								.getMpConsume(sk)) {
					_accessor.doCast(sk);
					return;
				}
				max_range = Math.max(max_range, sk.getCastRange());
			}
			if (!isNotMoving())
				moveToPawn(getAttackTarget(), max_range);
			return;
		}
	}

	protected void thinkAttackGroup() {
		L2Character target = getForcedTarget();
		if (target == null || target.isAlikeDead()) {
			// try to get next group target
			setForcedTarget(findNextGroupTarget());
			clientStopMoving(null);
		}
		if (target == null)
			return;
		L2Skill[] skills = null;
		double dist2 = 0;
		int range = 0;
		int max_range = 0;
		_actor.setTarget(target);
		// as a response, we put the target in a forcedattack mode
		L2ControllableMobInstance theTarget = (L2ControllableMobInstance) target;
		L2ControllableMobAI ctrlAi = (L2ControllableMobAI) theTarget.getAI();
		ctrlAi.forceAttack(_actor);
		try {
			skills = _actor.getAllSkills();
			dist2 = _actor.getPlanDistanceSq(target.getX(), target.getY());
			range = _actor.getPhysicalAttackRange()
					+ _actor.getTemplate().collisionRadius
					+ target.getTemplate().collisionRadius;
			max_range = range;
		} catch (NullPointerException e) {
			_log.warning("Encountered Null Value.");
			e.printStackTrace();
		}
		if (!_actor.isMuted() && dist2 > (range + 20) * (range + 20)) {
			// check distant skills
			for (L2Skill sk : skills) {
				int castRange = sk.getCastRange();
				if (castRange * castRange >= dist2
						&& !_actor.isSkillDisabled(sk.getId())
						&& _actor.getCurrentMp() > _actor.getStat()
								.getMpConsume(sk)) {
					_accessor.doCast(sk);
					return;
				}
				max_range = Math.max(max_range, castRange);
			}
			if (!isNotMoving())
				moveToPawn(target, range);
			return;
		}
		_accessor.doAttack(target);
	}

	protected void thinkForceAttack() {
		if (getForcedTarget() == null || getForcedTarget().isAlikeDead()) {
			clientStopMoving(null);
			setIntention(AI_INTENTION_ACTIVE);
			setAlternateAI(AI_IDLE);
		}
		L2Skill[] skills = null;
		double dist2 = 0;
		int range = 0;
		int max_range = 0;
		try {
			_actor.setTarget(getForcedTarget());
			skills = _actor.getAllSkills();
			dist2 = _actor.getPlanDistanceSq(getForcedTarget().getX(),
					getForcedTarget().getY());
			range = _actor.getPhysicalAttackRange()
					+ _actor.getTemplate().collisionRadius
					+ getForcedTarget().getTemplate().collisionRadius;
			max_range = range;
		} catch (NullPointerException e) {
			_log.warning("Encountered Null Value.");
			e.printStackTrace();
		}
		if (!_actor.isMuted() && dist2 > (range + 20) * (range + 20)) {
			// check distant skills
			for (L2Skill sk : skills) {
				int castRange = sk.getCastRange();
				if (castRange * castRange >= dist2
						&& !_actor.isSkillDisabled(sk.getId())
						&& _actor.getCurrentMp() > _actor.getStat()
								.getMpConsume(sk)) {
					_accessor.doCast(sk);
					return;
				}
				max_range = Math.max(max_range, castRange);
			}
			if (!isNotMoving())
				moveToPawn(getForcedTarget(), _actor.getPhysicalAttackRange()/* range */);
			return;
		}
		_accessor.doAttack(getForcedTarget());
	}

	protected void thinkAttack() {
		if (getAttackTarget() == null || getAttackTarget().isAlikeDead()) {
			if (getAttackTarget() != null) {
				// stop hating
				L2Attackable npc = (L2Attackable) _actor;
				npc.stopHating(getAttackTarget());
			}
			setIntention(AI_INTENTION_ACTIVE);
		} else {
			// notify aggression
			if (((L2NpcInstance) _actor).getFactionId() != null) {
				String faction_id = ((L2NpcInstance) _actor).getFactionId();
				for (L2Object obj : _actor.getKnownList().getKnownObjects()
						.values()) {
					if (!(obj instanceof L2NpcInstance))
						continue;
					L2NpcInstance npc = (L2NpcInstance) obj;
					if (faction_id != npc.getFactionId())
						continue;
					if (_actor.isInsideRadius(npc, npc.getFactionRange(),
							false, true)
							&& Math.abs(getAttackTarget().getZ() - npc.getZ()) < 200)
						npc.getAI().notifyEvent(CtrlEvent.EVT_AGGRESSION,
								getAttackTarget(), 1);
				}
			}
			L2Skill[] skills = null;
			double dist2 = 0;
			int range = 0;
			int max_range = 0;
			try {
				_actor.setTarget(getAttackTarget());
				skills = _actor.getAllSkills();
				dist2 = _actor.getPlanDistanceSq(getAttackTarget().getX(),
						getAttackTarget().getY());
				range = _actor.getPhysicalAttackRange()
						+ _actor.getTemplate().collisionRadius
						+ getAttackTarget().getTemplate().collisionRadius;
				max_range = range;
			} catch (NullPointerException e) {
				_log.warning("Encountered Null Value.");
				e.printStackTrace();
			}
			if (!_actor.isMuted() && dist2 > (range + 20) * (range + 20)) {
				// check distant skills
				for (L2Skill sk : skills) {
					int castRange = sk.getCastRange();
					if (castRange * castRange >= dist2
							&& !_actor.isSkillDisabled(sk.getId())
							&& _actor.getCurrentMp() > _actor.getStat()
									.getMpConsume(sk)) {
						_accessor.doCast(sk);
						return;
					}
					max_range = Math.max(max_range, castRange);
				}
				moveToPawn(getAttackTarget(), range);
				return;
			}
			// Force mobs to attack anybody if confused.
			L2Character hated;
			if (_actor.isConfused())
				hated = findNextRndTarget();
			else
				hated = getAttackTarget();
			if (hated == null) {
				setIntention(AI_INTENTION_ACTIVE);
				return;
			}
			if (hated != getAttackTarget())
				setAttackTarget(hated);
			if (!_actor.isMuted() && skills.length > 0 && Rnd.nextInt(5) == 3)
				for (L2Skill sk : skills) {
					int castRange = sk.getCastRange();
					if (castRange * castRange >= dist2
							&& !_actor.isSkillDisabled(sk.getId())
							&& _actor.getCurrentMp() < _actor.getStat()
									.getMpConsume(sk)) {
						_accessor.doCast(sk);
						return;
					}
				}
			_accessor.doAttack(getAttackTarget());
		}
	}

	private void thinkActive() {
		setAttackTarget(findNextRndTarget());
		L2Character hated;
		if (_actor.isConfused())
			hated = findNextRndTarget();
		else
			hated = getAttackTarget();
		if (hated != null) {
			_actor.setRunning();
			setIntention(CtrlIntention.AI_INTENTION_ATTACK, hated);
		}
		return;
	}

	private boolean autoAttackCondition(L2Character target) {
		if (target == null || !(_actor instanceof L2Attackable))
			return false;
		L2Attackable me = (L2Attackable) _actor;
		if (target instanceof L2FolkInstance
				|| target instanceof L2DoorInstance)
			return false;
		if (target.isAlikeDead()
				|| !me.isInsideRadius(target, me.getAggroRange(), false, false)
				|| Math.abs(_actor.getZ() - target.getZ()) > 100)
			return false;
		// Check if the target isn't invulnerable
		if (target.isInvul())
			return false;
		// Check if the target is a L2PcInstance
		if (target instanceof L2PcInstance)
			// Check if the target isn't in silent move mode
			if (((L2PcInstance) target).isSilentMoving())
				return false;
		if (target instanceof L2NpcInstance)
			return false;
		return me.isAggressive();
	}

	private L2Character findNextRndTarget() {
		int aggroRange = ((L2Attackable) _actor).getAggroRange();
		L2Attackable npc = (L2Attackable) _actor;
		int npcX, npcY, targetX, targetY;
		double dy, dx;
		double dblAggroRange = aggroRange * aggroRange;
		List<L2Character> potentialTarget = new FastList<L2Character>();
		for (L2Object obj : npc.getKnownList().getKnownObjects().values()) {
			if (!(obj instanceof L2Character))
				continue;
			npcX = npc.getX();
			npcY = npc.getY();
			targetX = obj.getX();
			targetY = obj.getY();
			dx = npcX - targetX;
			dy = npcY - targetY;
			if (dx * dx + dy * dy > dblAggroRange)
				continue;
			L2Character target = (L2Character) obj;
			if (autoAttackCondition(target))
				potentialTarget.add(target);
		}
		if (potentialTarget.size() == 0)
			return null;
		// we choose a random target
		int choice = Rnd.nextInt(potentialTarget.size());
		L2Character target = potentialTarget.get(choice);
		return target;
	}

	private L2ControllableMobInstance findNextGroupTarget() {
		return getGroupTarget().getRandomMob();
	}

	public L2ControllableMobAI(AIAccessor accessor) {
		super(accessor);
		setAlternateAI(AI_IDLE);
	}

	public int getAlternateAI() {
		return _alternateAI;
	}

	public void setAlternateAI(int _alternateai) {
		_alternateAI = _alternateai;
	}

	public void forceAttack(L2Character target) {
		setAlternateAI(AI_FORCEATTACK);
		setForcedTarget(target);
	}

	public void forceAttackGroup(MobGroup group) {
		setForcedTarget(null);
		setGroupTarget(group);
		setAlternateAI(AI_ATTACK_GROUP);
	}

	public void stop() {
		setAlternateAI(AI_IDLE);
		clientStopMoving(null);
	}

	public void move(int x, int y, int z) {
		moveTo(x, y, z);
	}

	public void follow(L2Character target) {
		setAlternateAI(AI_FOLLOW);
		setForcedTarget(target);
	}

	public boolean isThinking() {
		return _isThinking;
	}

	public boolean isNotMoving() {
		return _isNotMoving;
	}

	public void setNotMoving(boolean isNotMoving) {
		_isNotMoving = isNotMoving;
	}

	public void setThinking(boolean isThinking) {
		_isThinking = isThinking;
	}

	private L2Character getForcedTarget() {
		return _forcedTarget;
	}

	private MobGroup getGroupTarget() {
		return _targetGroup;
	}

	private void setForcedTarget(L2Character forcedTarget) {
		_forcedTarget = forcedTarget;
	}

	private void setGroupTarget(MobGroup targetGroup) {
		_targetGroup = targetGroup;
	}
}
